Bags under the eyes are puffiness of the lower eyelid. Because the eyelid skin is thin and the subcutaneous tissue is thin and loose, edema is easy to occur. Heredity is an important factor, and it becomes more and more obvious with age. In addition, kidney disease, pregnancy, lack of sleep or fatigue can all lead to the accumulation of eye drops and the formation of bags under the eyes. This phenomenon can easily make people look old and haggard. In order to avoid bags under the eyes, we must first find out the reason, so that we can prescribe the right medicine. If it is caused by a disease, it must be treated.